A MOTHER has broken down in tears as the details of her son's stalking against his ex-partner were read out in a local court.

Levii Shane Mitchell, 23, from Alligator Creek stalked his ex-girlfriend over a number of days, banging on her windows at night, leaving abusive handwritten notes and storming into her work, yelling he'd ruin her life.

In one instance, his victim was forced to retreat into a bedroom, frantically phoning police for help as Mitchell smashed a window and screamed at her.

Nevertheless, the woman later called Mitchell's lawyer, describing him as a decent fellow who'd been affected by drugs and alcohol, apparently shocked he'd been serving time in prison.

Mitchell faced Mackay Magistrates Court on Friday after spending 144 days behind bars, pleading guilty to crimes which occurred in the midst of a messy break-up.

His charges were unlawful stalking, wilful damage and public nuisance.

Mitchell's mother began crying and left the courtroom for a short while as the charges were detailed during sentencing by Magistrate Damien Dwyer.

Prosecutor Bernhard Berger provided the agreed facts of the case, reading out three abusive notes Mitchell wrote to his victim.

On one occasion, after confronting his victim at her work, Mitchell placed this note on her car window: "Cheers for proving yet again you don't give two f**ks how you make me feel. You throw everything I try to do in my face. I'm better off without you. Enjoy your two-faced, fake as f**k life. See you at yours, darl. Bye."

Mitchell's defence solicitor Antoinette Morton, of Morton Lawyers, described Mitchell's behaviour as out of character, and said he was "very remorseful".

But the magistrate declared it was a continuation of his offending, noting prior charges of assaulting or obstructing police and wilful damage.

Further, Ms Morton said it had been Mitchell's first relationship and he'd reacted badly to challenges in the relationship.

She said Mitchell was a fitter by trade, who had also worked as a sandblaster, and would have a job on release from prison.

Mitchell had accepted he needed help with anger management and tackling drug addiction, Ms Morton added.

Mr Dwyer said Mitchell had made an early guilty plea and had already spent enough time in jail, where he'd worked constructively.

Mitchell received a head sentence of three months and was released immediately on parole.